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Searching for double σ- and π-aromaticity in borazine derivatives

机译:在硼杉衍生物中寻找双σ和π-芳香性

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Inspired by the double-aromatic (σ and π) C _(6) H _(3) ~(+) , C _(6) I _(6) ~(2+) , and C _(6) (SePh) _(6) ~(2+) ring-shaped compounds, herein we theoretically study their borazine derivative analogues. The systems studied are the cation and dications with formulas B _(3) N _(3) H _(3) ~(+) , B _(3) N _(3) Br _(6) ~(2+) , B _(3) N _(3) I _(6) ~(2+) , B _(3) N _(3) (SeH) _(6) ~(2+) , and B _(3) N _(3) (TeH) _(6) ~(2+) . Our DFT calculations indicate that the ring-shaped planar structures of B _(3) N _(3) H _(3) ~(+) , B _(3) N _(3) I _(6) ~(2+) , and B _(3) N _(3) (TeH) _(6) ~(2+) are more stable in the singlet state, while those of B _(3) N _(3) Br _(6) ~(2+) and B _(3) N _(3) (SeH) _(6) ~(2+) prefer the triplet state. Besides, exploration of the potential energy surface shows that the ring-shaped structure is the putative global minimum only for B _(3) N _(3) I _(6) ~(2+) . According to chemical bonding analysis, B _(3) N _(3) H _(3) ~(+) , B _(3) N _(3) I _(6) ~(2+) , and B _(3) N _(3) (TeH) _(6) ~(2+) have σ and π delocalized bonds. The number of delocalized σ/π electrons is 2/6 for the first, and 10/6 for the second and third, similar to what their carbon analogs exhibit. Finally, the analysis of the magnetically induced current density allows B _(3) N _(3) H _(3) ~(+) , B _(3) N _(3) I _(6) ~(2+) , and B _(3) N _(3) (TeH) _(6) ~(2+) to be classified as strongly σ aromatic, and poorly π aromatic compounds.
机译:由双芳族(σ和π)C_(6)H _(3)〜(+),C _(6)I _(6)〜(2+),以及C _(6)(Seph )_(6)〜(2+)环形化合物,在本文中,我们理论上研究其硼杉衍生物类似物。研究的系统是阳离子和乳型B _(3)N _(3)H _(3)〜(+),B _(3)N _(3)BR _(6)〜(2+) ,b _(3)n _(3)i _(6)〜(2+),b _(3)n _(3)(seh)_(6)〜(2+),b _(3 )n _(3)(teh)_(6)〜(2+)。我们的DFT计算表明,B _(3)N _(3)H _(3)〜(+),B _(3)N _(3)I _(6)〜(2的环形平面结构+),B _(3)n _(3)(teh)_(6)〜(2+)在单线态中更稳定,而b _(3)n _(3)br _( 6)〜(2+)和B _(3)n _(3)(SEH)_(6)〜(2+)更喜欢三重态状态。此外,潜在能量表面的探索表明,环形结构是仅适用于B _(3)N _(3)I _(6)〜(2+)的推定的全局最小值。根据化学键合分析,B _(3)N _(3)H _(3)〜(+),B _(3)n _(3)I _(6)〜(2+),和B _ (3)n _(3)(teh)_(6)〜(2+)具有σ和π分层键。临床化σ/π电子的数量为第一和第三和第三的第2/6,类似于它们的碳类似物表现出的。最后,对磁感应电流密度的分析允许B _(3)N _(3)H _(3)〜(+),B _(3)n _(3)I _(6)〜(2+ )和B _(3)n _(3)(teh)_(6)〜(2+)被分类为强烈σ芳族,且π芳族化合物差。

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